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CALDERA / CRATER. CRATER – FUNNEL SHAPED PIT AT THE TOP OF A VOLCANO. FORMED WHEN MATERIAL IS BLOWN OUT OF THE VOLCANO BY EXPLOSIONS CALDERA – WHEN THE VOLCANO COLLAPSES DUE TO AN EMPTY MAGMA CHAMBER. CRATER. CRATER. CALDERA. CALDERA. Intrusive Volcanic Features.

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Caldera crater
CALDERA / CRATER

CRATER – FUNNEL SHAPED PIT AT THE TOP OF A VOLCANO. FORMED WHEN MATERIAL IS BLOWN OUT OF THE VOLCANO BY EXPLOSIONS

CALDERA – WHEN THE VOLCANO COLLAPSES DUE TO AN EMPTY MAGMA CHAMBER.







  • Sills are thin horizontal sheets of hardened magma between layers.

  • Laccoliths are blister-like intrusions, usually near the surface, that form when magma pushes overlying layers upward.

  • Dikes are thin vertical sheets of hardened magma intruded into fractures in the crust.

  • Batholiths are usually granitic and cover hundreds or thousands of square kilometers.




  • The neck of a volcano is the solidified material that fills the vent or pipe of a dead volcano.


Devils Tower is a volcanic neck that is 865' tall.

It is located in northeastern Wyoming. It was the first National Monument proclaimed in the United States.


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